靜態持住姿勢肌群作用與共作用程度研究

Analysis of Myoelectric Acitivity and Coactivation During Static Holding Postures

邱文科(Wen-Ko Chiou) ； 李永輝(Yung-Hui Lee) ； 陳文哲(Wen-Jer Chen) ； 李明義(Ming-Yih Lee) ； 林燕慧(Yang-Hua Lin) ； 鄧復旦(Fuk-Tan Tang)

《中華民國復健醫學會雜誌》 23卷1期 (1995/06) Pp. 51-58

摘要

搬運容易造成下背痛，表面肌電圖常被用來驗證腰椎力學模式之預測能力，也有研究利用它來評佔下背痛患者的肌群功能。本研究在探討搬運時相關肌群的個別與相互作用程度，並篩選搬運因子，作為臨床上評估搬運能力之檢查項目。四十位無背痛經驗的自願者參與本實驗，其中男性26位，女性14位，每位受試者隨機接受四種搬運因子(膝關節角度、髖關節角度、搬運物水平距離典重量)的測試，使用表面肌電設備同時收集八個搬運相關肌群右側的肌電訊號。結果顯示四種搬運因子對八個肌群的作用程度，均會產生顯著的影響;另外，四種搬運因子對腹部、背部、上肢與下肢的肌群，也有明顯不同的共作用程度。在有顯著的搬運變項與檢查的安全考量下，最後篩選12項搬運能力檢查項目。從搬運情境肌群作用程度之觀點，本研究證實可繼輯研究正常者與下背痛病患之差異，作為病患復健成效之參考。

關鍵字

共作用程度 ； 肌電圖 ； 搬運 ； 下背痛

並列摘要

The object of this study is to examine co-activities of eight muscle group in various lifting conditions. A total of 40 voluntary subjects with no experience of low back pain participated in this experiment. The muscle activities of interested were bicep brachii, thoracic erector spinae, lumbar erector spinae, latissimus dorsi, external oblique, rectus abdominis, rectus femoris, and semitendinosus of the right side body. Surface EMG signals were obtained in static holding postures of 3 kneeing angles, 5 trunk flexion angles, 2 horizontal liftingdistances, and 3 loading conditions. After recording, the percentages of maximum voluntary contraction (NEMG) and relative activity level (RAL) were calculated as indications of level of participations in each individual level.
Analysis of variance result indicated significant effects of the examined tasks variables on NEMGs and RALs (p＜0.05). Depends on concentric or eccentric joint motion, which either shorten or lengthen the examined muscle lengths, so as lead to an increase or decrease of the recorded EMG. Increase in EMG data can also attributed to an increase of external loads, an increase of horizontal holding distance, and the necessity of static contractions to maintain posture in balance. In addition, increase of trunk flexion angle decrease the horizontal moment arm of biceps and increase the length of semitendinosus so as increase their activation levels. Increase of knee flexion angle would restrict pelvis rotation and affect the linear relations between the trunk flexion angle and NEMG of the back muscles- This study constitutes an important part of understanding the feasibility of using surface EMG to examining muscle coactivation in functional posture of load holding.

並列關鍵字

coactivation ； lifting ； electromyography ； low back pain